Data was collected on age (in years) and blood pressure (in millimeters of mercury)...

Data was collected on age (in years) and blood pressure (in millimeters of mercury) from a sample of people living in a particular country. A scatterplot of the data was produced.

The method of least squares was used to fit a straight line model to this data. The equation of the least squares fit line is

y = 98.7 + 0.971x

a) choose more meaningful labels for the explanatory and dependant variables, and hence write down an equation that may be used to model the relationship between a person's age and their blood pressure.

b) Use this equation to predict the blood pressure for a person whose age is 45 years.

c) Person A is 5 years older than person B. According to the model, what is the prediced difference between the blood pressures of person A and person B?